• Spray the inside of a slow cooker with cooking spray. Place ingredients for the topping — 1 cup water, brown sugar and cocoa powder — in a small saucepan over medium heat. Stir until the sugar dissolves, about 3 minutes. Set aside.

• Place the two brownie mixes, peanut butter, butter, eggs and ¼ cup water in a large bowl, and stir until well combined. Fold in the chocolate chips. Spoon batter into the slow cooker, and spread it evenly on the bottom.

Pour the brown sugar topping over the batter. Put on the lid, and cook on high for 2 hours. Open the lid, use a spatula or spoon to spread any remaining liquid evenly over the pudding. Turn heat to low and continue cooking, with the lid off, for 30 minutes.